Got me a business trip down there, kinda I fix PC, I get room and food all paid for and Fuel, upshot is I've got 2 days to ride and plan to go into the dark on both days.
I guess go around the Coast in the 1 direction, then the other direction the next day, I've walked around there but should get out 4 times as far.
The costal path around Torquay is not "legal" for bikes.
It is full of coves which are not really ridable (although you may get down some if your mad)
You will have to cut back inland in places and naving in dark is not going to be easy.
Riding along beach fronts is not too bad but its not continuous with rocky headlands.
Also I dont know your starting point but there are lots of waterways that will need crossing so its a trip to the ferry or nearest upstream bridge. (ie Dartmouth)
Starting at Hope Cove, and well I'll improvise, was thinking about the water ways, don't think my budget will stretch to ferrys, so riding around maybe.
No, worries about Naving in the Dark, if worse comes to worse I'll get on a road and zip back to base.